Midea V8 VRF Series Service Manual page 37

V8 VRF Indoor Units
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Set Temperature Display
1) When switching between cooling, heating or auto modes, if temperature Ts is not reset, the temperature after
switching is the same as the temperature before switching.
2) In auto mode, switching between cooling and heating mode takes some time. The time can be set through the
controller.
4.7 Controlling the Condensate Water Pump and Water Level Switch
1) When the IDU is powered on the first time, the water pump is forced to operate for 5 minutes.
2) When the IDU and ODU are in cooling, dehumidification and self-cleaning mode, the water pump starts immediately
and operates continuously. After this mode is stopped (stop or mode switch), the water pump turns off five minutes
later.
3) If the water level rises, causing the water level switch to be disconnected, the condensate water pump immediately
starts and operates. Five minutes later, if the water level drops to lower than the alarm level, the system restores
operation based on the originally set mode. Otherwise, the IDU and water pump stop operating, and a water level
alarm is reported. When the water level switch is connected again, the protection is released, and the system restores
operation based on the mode that was originally set.
Note:
This function is reserved for the unit models without drainage pumps and water level switches and it is disabled by default.
4.8 Anti-freeze Control
The IDU will close Electronic expansion valve, and the wind shift into speed 1.
Condition:
A) Entry conditions: Coil temperature ≤A continuous T1 or coil temperature ≤B continuous T2, and in any mode of
forced cooling, cooling, dehumidification, self-cleaning(Except for the second stage);
B) Exit condition: coil temperature ≥C continuous T3, and not in any mode of forced cooling, cooling,
dehumidification, or at the second stage of self-cleaning mode;
4.9 Remote switch control
1. Remote switch is set by ODU, which can be set as positive logic and negative logic by controllers, and the default setting
is positive logic (The parameter code is"N38").
2. The delay time of remote shutdown can be set by controllers. There is no delay by default, or 1-10min delay can be
selected (The parameter code is"N39").
4.10 Alarm control
When using the wire controller, the current fault code will be displayed. Refer to the relevant instructions for other
controllers。
4.11 High ceiling setting
For embedded IDU models, such as one-way cassette, t one-way cassette and Four-way Cassette models, when the
installation exceeds the specified height (default 3 meters), can enter the High ceiling setting ( The parameter code
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